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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include "log.h"
#include "server.h"
#define BUF_CAP 80000
#define COMMON_CAP 1024
#define PORT "8079"
#define RM_LF(str) do { \
signed long len = strlen(str)-1; \
if(len >= 0 && str[len] == '\n') str[len] = '\0'; \
} while(0)
#define _SEND_BUF_ADD(str) do { \
memcpy(&send_buf[send_buf_sz], str, strlen(str)); \
send_buf_sz += strlen(str); \
} while(0)
#define _SEND_BUF_ADD_LINE(str) do { \
_SEND_BUF_ADD(str); \
_SEND_BUF_ADD("\r\n"); \
} while(0)
#define SEND_BUF_ADD(str) do { \
memcpy(&send_buf[*send_buf_sz], str, strlen(str)); \
*send_buf_sz += strlen(str); \
} while(0)
#define SEND_BUF_ADD_LINE(str) do { \
SEND_BUF_ADD(str); \
SEND_BUF_ADD("\r\n"); \
} while(0)
#define LOAD_FILE() do { \
if(is_binary) { \
fseek(fp, 0, SEEK_END); \
size_t file_sz = ftell(fp); \
rewind(fp); \
\
fread(&send_buf[*send_buf_sz], sizeof(char), file_sz, fp); \
*send_buf_sz += file_sz; \
} else { \
char line[BUF_CAP]; \
while(fgets(line, sizeof(line), fp) != NULL) \
{ \
RM_LF(line); \
SEND_BUF_ADD_LINE(line); \
} \
} \
} while(0)
static int get_content_type(char *file_path, char *content_type)
{
char cmd[COMMON_CAP + 64];
sprintf(cmd, "/usr/bin/file -ib %s", file_path);
FILE *fp = popen(cmd, "r");
if(!fp) {
err("popen: cmd %s: %s", cmd, strerror(errno));
return 1;
}
if(fgets(content_type, COMMON_CAP, fp) == NULL) {
err("get_mime_type: no output from fgets");
return 1;
}
pclose(fp);
RM_LF(content_type);
char ct_cpy[COMMON_CAP];
strcpy(ct_cpy, content_type);
strtok(ct_cpy, "=");
// the only thing after the '=' should be the either binary or something else (text)
char *charset = strtok(NULL, "=");
if(charset == NULL || strcmp(charset, "binary") != 0) {
return 0;
}
return -1;
}
static int try_file(char *req_path, FILE **fp, char *content_type)
{
char file_path[COMMON_CAP];
sprintf(file_path, "%s%s", FILES,
(strlen(req_path) == 1) ? "/index.html" : req_path);
*fp = fopen(file_path, "r");
if(!(*fp)) {
err("fopen: file %s: %s", file_path, strerror(errno));
return 1;
}
info("fopen: file %s was opened", file_path);
return get_content_type(file_path, content_type);
}
static int on_get(char *send_buf, ssize_t *send_buf_sz, char *req_path)
{
char content_type[COMMON_CAP];
int is_binary; // 0 - no; -1 - yes; 1 - error
FILE *fp;
if((is_binary = try_file(req_path, &fp, content_type)) == 1) {
if(errno == 2) { // 2 is 'No such file or directory'
SEND_BUF_ADD_LINE("404");
if((is_binary = try_file("/404.html", &fp, content_type)) != 0) return 1;
} else {
SEND_BUF_ADD_LINE("500");
if((is_binary = try_file("/500.html", &fp, content_type)) != 0) return 1;
}
} else {
SEND_BUF_ADD_LINE("200");
}
SEND_BUF_ADD_LINE("Server: potato");
SEND_BUF_ADD("Content-Type: ");
SEND_BUF_ADD_LINE(content_type);
SEND_BUF_ADD("\r\n");
LOAD_FILE();
fclose(fp);
return 0;
}
static int handle_connection(sock_t *conn)
{
char recv_buf[BUF_CAP] = {0};
ssize_t recv_buf_len = server_recv(conn, recv_buf, BUF_CAP);
if(recv_buf_len == 0) {
return 0;
} else if(recv_buf_len < 0) {
err("server_recv: %s", strerror(errno));
return 1;
}
/* HANDLE REQUEST */
char send_buf[BUF_CAP];
ssize_t send_buf_sz = 0;
_SEND_BUF_ADD("HTTP/1.1 ");
char recv_buf_cpy[BUF_CAP];
memcpy(recv_buf_cpy, recv_buf, recv_buf_len);
char *req_method = strtok(recv_buf_cpy, " ");
if(strcmp(req_method, "GET") == 0) {
if(on_get(send_buf, &send_buf_sz, strtok(NULL, " "))) {
err("on_get: failed");
return 1;
}
} else {
err("request method %s has not been implemented", req_method);
return 1;
}
// TODO: handle when the whole message is not sent
ssize_t sent_sz = server_send(conn, send_buf, send_buf_sz);
if(sent_sz < 0) {
err("server_send: %s", strerror(errno));
return 1;
}
info("server_send: sent %ld out of %ld bytes", sent_sz, send_buf_sz);
return 0;
}
int main(void)
{
signal(SIGCHLD, SIG_IGN); // now i dont have to wait()
sock_t *sock = server_sock_create();
if(server_start(PORT, sock) != 0) {
err("server_init: failed");
return 1;
}
for(int i = 0; ; i++) {
sock_t *conn = server_sock_create();
if(server_accept(sock, conn) != 0) {
err("server_accept: failed");
}
info("server: got connection with %s", server_connection_ip(conn));
pid_t p = fork();
if(p == 0) {
server_sock_close(sock);
if(handle_connection(conn) != 0) {
err("handle_connection: failed");
} else {
info("server: got disconnected with %s", server_connection_ip(conn));
}
server_sock_close(conn);
return 0;
} else if (p < 0){
err("fork: %s", strerror(errno));
return 1;
}
server_sock_close(conn);
}
server_sock_close(sock);
return 0;
}
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